+Adenoids are a patch of [lymphoid tissue](/wiki/Lymphoid_Tissue) located at the back of the nasal cavity, part of the body's [immune system](/wiki/Immune_System). They can swell, especially in children, potentially obstructing breathing and affecting sleep.
+## See also
+- [Tonsils](/wiki/Tonsils)
+- [Nasopharynx](/wiki/Nasopharynx)
+- [Breathing](/wiki/Breathing)